Fracture toughness of Si3N4 ceramic composites: Effect of texture

Fabrication of Si3N4 ceramics substrates with high thermal conductivity by tape casting and gas pressure sintering

“…Chips will emit a considerable quantity of heat during operation as the power and integration of electronic devices continue to improve. The performance of electrical equipment will be impacted, and even the devices themselves may be damaged if this heat is not efficiently dissipated in a timely way 3–5 . This development trend puts forward higher requirements for ceramic substrates.…”

Matrix-Directed Mineralization for Bulk Structural Materials

“…This can be improved by steering the structure and composition of MBSMs at different scales. A typical example is advanced structural ceramics with high fracture toughness such as fiber-reinforced ceramics. − However, by calculating the fracture toughness ratio of the MBSMs including advanced structural ceramics to the corresponding raw material, it can be found that the relative toughness amplification of artificial MBSMs is much less impressive than that of some biominerals (Figure ). − Analyses of these biominerals have revealed their stunning hierarchical structures, in which brittle minerals and soft organics are well-organized (Figure ).…”

“…A typical example is advanced structural ceramics with high fracture toughness such as fiber-reinforced ceramics. − However, by calculating the fracture toughness ratio of the MBSMs including advanced structural ceramics to the corresponding raw material, it can be found that the relative toughness amplification of artificial MBSMs is much less impressive than that of some biominerals (Figure ). − Analyses of these biominerals have revealed their stunning hierarchical structures, in which brittle minerals and soft organics are well-organized (Figure ). − The relationships between the hierarchical structures of these biominerals and their outstanding fracture toughness as well as the relative toughness amplification have been extensively discussed and summarized in previous excellent reviews. , A most studied model for mechanical performance is nacre, which is the nacreous inner layer of some mollusk shells (Figure a).…”

“…At microscale, nacre consists of alternating aragonite layers (>95 vol %) and organic layers (<5 vol %), and each aragonite layer is divided into polygonal platelets. At nanoscale, the aragonite platelets are composed of nanograins with the same crystallographic orientation, which are known as mesocrystals. − It can be concluded from these works − that the complexity and precision of the control over the structure and composition of these biominerals far surpass that of any artificial MBSMs. Therefore, a promising way to further optimize the mechanical performance of artificial MBSMs is to learn from the design principles and the associated toughening mechanisms of these biominerals, and then to make artificial MBSMs hierarchically structured .…”

“…Ashby diagram of the toughness amplification versus the major ceramic content of the nonbiomimetic structural ceramics and natural mollusk nacre. − …”